package com.esri.hadoop.hive;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.exec.UDFArgumentLengthException;
import org.apache.hadoop.hive.serde2.io.DoubleWritable;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Text;


import com.esri.core.geometry.MultiPoint;
import com.esri.core.geometry.ogc.OGCGeometry;

@Description(
	name = "ST_MultiPoint",
	value = "_FUNC_(x1, y1, x2, y2, x3, y3) - constructor for 2D multipoint\n" +
    "_FUNC_('multipoint( ... )') - constructor for 2D multipoint",
	extended = "Example:\n" +
	"  SELECT _FUNC_(1, 1, 2, 2, 3, 3) from src LIMIT 1; -- multipoint with 3 points\n" + 
	"  SELECT _FUNC_('MULTIPOINT ((10 40), (40 30))') from src LIMIT 1; -- multipoint of 2 points")
//@HivePdkUnitTests(
//	cases = { 
//		@HivePdkUnitTest(
//			query = "select st_asjson(st_multipoint(1, 1, 2, 2, 3, 3)) from onerow",
//			result = "{\"points\":[[1.0,1.0],[2.0,2.0],[3.0,3.0]]}"
//			),
//		@HivePdkUnitTest(
//			query = "select ST_GeometryType(ST_MultiPoint('MULTIPOINT ((10 40), (40 30))')) from onerow",
//			result = "ST_MULTIPOINT"
//			),
//		@HivePdkUnitTest(
//			query = "select ST_Equals(ST_MultiPoint('MULTIPOINT ((10 40), (40 30))'), ST_GeomFromText('MULTIPOINT ((10 40), (40 30))')) from onerow",
//			result = "true"
//			)
//	}
//)

public class ST_MultiPoint extends ST_Geometry {

	static final Log LOG = LogFactory.getLog(ST_MultiPoint.class.getName());

	// Number-pairs constructor
	public BytesWritable evaluate(DoubleWritable ... xyPairs) throws UDFArgumentLengthException{

		if (xyPairs == null || xyPairs.length == 0 ||  xyPairs.length%2 != 0) {
			LogUtils.Log_VariableArgumentLengthXY(LOG);
			return null;
		}

		try {
			MultiPoint mPoint = new MultiPoint();

			for (int i=0;i<xyPairs.length;i+=2){
				mPoint.add(xyPairs[i].get(), xyPairs[i+1].get());
			}

			return GeometryUtils.geometryToEsriShapeBytesWritable(OGCGeometry.createFromEsriGeometry(mPoint, null, true));
		} catch (Exception e) {
		    LogUtils.Log_InternalError(LOG, "ST_MultiPoint: " + e);
		    return null;
		}
	}

	// WKT constructor - can use SetSRID on constructed multi-point
	public BytesWritable evaluate(Text wkwrap) throws UDFArgumentException {
		String wkt = wkwrap.toString();
		try {
			OGCGeometry ogcObj = OGCGeometry.fromText(wkt);
			ogcObj.setSpatialReference(null);
			if (ogcObj.geometryType().equals("MultiPoint")) {
				return GeometryUtils.geometryToEsriShapeBytesWritable(ogcObj);
			} else {
				LogUtils.Log_InvalidType(LOG, GeometryUtils.OGCType.ST_MULTIPOINT, GeometryUtils.OGCType.UNKNOWN);
				return null;
			}
		} catch (Exception e) {  // IllegalArgumentException, GeometryException
				LogUtils.Log_InvalidText(LOG, wkt);
				return null;
		}
	}

}
